CVE-2021-4105

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2023-02-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Improper Handling of Parameters vulnerability in BG-TEK COSLAT Firewall allows Remote Code Inclusion.

This issue affects COSLAT Firewall: from 5.24.0.R.20180630 before 5.24.0.R.20210727.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
57%
KEV
Not listed

Published

February 24, 2023

Last Modified

May 18, 2026

Advisory Details (3)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

T.C. Siber Güvenlik Başkanlığı

https://www.usom.gov.tr/bildirim/tr-23-0108
generic

ÖNEMLİ: Kritik Güncelleme - 27-07-2021 tarihinde yayınlanan güncelleme içeriği | Coslat Firewall Blog

http://blog.coslat.com/2021/07/onemli-kritik-guncelleme-2021-07-27.html
generic

T.C. Siber Güvenlik Başkanlığı

https://siberguvenlik.gov.tr/guvenlik-bildirimleri/detay/tr-23-0108

Vendor Advisories for CVE-2021-4105(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 26× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 193 total refreshes for this CVE.

  1. 2026-09-19 15:38 UTCEPSS rescore
  2. 2026-09-18 19:24 UTCEPSS rescore
  3. 2026-09-17 19:23 UTCEPSS rescore
  4. 2026-09-16 14:05 UTCEPSS rescore
  5. 2026-09-16 14:05 UTCEPSS rescore
  6. 2026-09-15 03:06 UTCEPSS rescore
  7. 2026-09-12 14:57 UTCEPSS rescore
  8. 2026-09-11 14:49 UTCEPSS rescore
  9. 2026-09-11 09:33 UTCEPSS rescore
  10. 2026-09-08 21:57 UTCEPSS rescore
  11. 2026-09-07 15:58 UTCEPSS rescore
  12. 2026-09-06 13:45 UTCEPSS rescore
  13. 2026-09-05 15:25 UTCEPSS rescore
  14. 2026-09-04 13:57 UTCEPSS rescore
  15. 2026-09-04 05:03 UTCEPSS rescore
  16. 2026-09-02 14:09 UTCEPSS rescore
  17. 2026-09-01 13:51 UTCEPSS rescore
  18. 2026-08-30 19:14 UTCEPSS rescore
  19. 2026-08-30 01:19 UTCEPSS rescore
  20. 2026-08-28 21:38 UTCEPSS rescore
  21. 2026-08-27 14:22 UTCEPSS rescore
  22. 2026-08-26 14:43 UTCEPSS rescore
  23. 2026-08-25 13:46 UTCEPSS rescore
  24. 2026-08-24 14:13 UTCEPSS rescore
  25. 2026-08-21 23:46 UTCEPSS rescore
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  1. 2026-08-20 22:52 UTCEPSS rescore
  2. 2026-08-19 17:01 UTCEPSS rescore
  3. 2026-08-18 13:45 UTCEPSS rescore
  4. 2026-08-16 14:53 UTCEPSS rescore
  5. 2026-08-16 02:11 UTCEPSS rescore
  6. 2026-08-15 01:27 UTCEPSS rescore
  7. 2026-08-13 21:57 UTCEPSS rescore
  8. 2026-08-12 13:48 UTCEPSS rescore
  9. 2026-08-11 13:38 UTCEPSS rescore
  10. 2026-08-09 13:44 UTCEPSS rescore
  11. 2026-08-08 16:34 UTCEPSS rescore
  12. 2026-08-07 16:24 UTCEPSS rescore
  13. 2026-08-06 13:44 UTCEPSS rescore
  14. 2026-08-05 19:15 UTCEPSS rescore
  15. 2026-08-04 15:06 UTCEPSS rescore
  16. 2026-08-04 10:34 UTCEPSS rescore
  17. 2026-08-03 10:33 UTCEPSS rescore
  18. 2026-08-02 02:24 UTCEPSS rescore
  19. 2026-08-01 04:13 UTCEPSS rescore
  20. 2026-07-30 16:25 UTCEPSS rescore
  21. 2026-07-30 01:28 UTCEPSS rescore
  22. 2026-07-28 15:33 UTCEPSS rescore
  23. 2026-07-26 14:52 UTCEPSS rescore
  24. 2026-07-25 14:15 UTCEPSS rescore
  25. 2026-07-24 14:15 UTCEPSS rescore
  26. 2026-07-24 14:15 UTCEPSS rescore
  27. 2026-07-23 14:16 UTCEPSS rescore
  28. 2026-07-23 02:04 UTCEG score recompute
  29. 2026-07-22 22:50 UTCEG score recompute
  30. 2026-07-22 14:06 UTCEPSS rescore
  31. 2026-07-21 15:22 UTCEPSS rescore
  32. 2026-07-21 15:22 UTCEPSS rescore
  33. 2026-07-20 17:05 UTCEPSS rescore
  34. 2026-07-19 14:29 UTCEPSS rescore
  35. 2026-07-19 02:27 UTCEPSS rescore
  36. 2026-07-19 02:27 UTCEPSS rescore
  37. 2026-07-18 10:02 UTCEPSS rescore
  38. 2026-07-16 17:00 UTCEPSS rescore
  39. 2026-07-16 17:00 UTCEPSS rescore
  40. 2026-07-15 16:55 UTCEPSS rescore
  41. 2026-07-15 01:58 UTCEPSS rescore
  42. 2026-07-15 01:58 UTCEPSS rescore
  43. 2026-07-13 22:27 UTCEPSS rescore
  44. 2026-07-13 06:11 UTCEPSS rescore
  45. 2026-07-13 06:11 UTCEPSS rescore
  46. 2026-07-12 05:44 UTCEPSS rescore
  47. 2026-07-11 08:25 UTCEPSS rescore
  48. 2026-07-09 19:07 UTCEPSS rescore
  49. 2026-07-09 19:07 UTCEPSS rescore
  50. 2026-07-08 15:12 UTCEPSS rescore
  51. 2026-07-08 15:12 UTCEPSS rescore
  52. 2026-07-07 13:43 UTCEPSS rescore
  53. 2026-07-06 16:25 UTCEPSS rescore
  54. 2026-07-06 16:25 UTCEPSS rescore
  55. 2026-07-06 02:21 UTCEPSS rescore
  56. 2026-07-06 02:21 UTCEPSS rescore
  57. 2026-07-05 02:28 UTCEPSS rescore
  58. 2026-07-05 02:28 UTCEPSS rescore
  59. 2026-07-04 06:29 UTCEPSS rescore
  60. 2026-07-04 06:29 UTCEPSS rescore
  61. 2026-07-01 15:04 UTCEPSS rescore
  62. 2026-06-30 23:20 UTCEPSS rescore
  63. 2026-06-28 14:05 UTCEPSS rescore
  64. 2026-06-28 04:54 UTCEPSS rescore
  65. 2026-06-28 04:54 UTCEPSS rescore
  66. 2026-06-27 03:07 UTCEPSS rescore
  67. 2026-06-27 03:06 UTCEPSS rescore
  68. 2026-06-25 13:48 UTCEPSS rescore
  69. 2026-06-25 13:48 UTCEPSS rescore
  70. 2026-06-24 14:03 UTCEPSS rescore
  71. 2026-06-24 14:03 UTCEPSS rescore
  72. 2026-06-23 21:31 UTCEPSS rescore
  73. 2026-06-23 21:31 UTCEPSS rescore
  74. 2026-06-22 14:24 UTCEPSS rescore
  75. 2026-06-21 14:55 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-4105?
CVE-2021-4105 is a critical vulnerability published on February 24, 2023. Improper Handling of Parameters vulnerability in BG-TEK COSLAT Firewall allows Remote Code Inclusion. This issue affects COSLAT Firewall: from 5.24.0.R.20180630 before 5.24.0.R.20210727.
When was CVE-2021-4105 disclosed?
CVE-2021-4105 was first published in the National Vulnerability Database on February 24, 2023, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-4105 actively exploited?
CVE-2021-4105 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 42.7% of all scored CVEs.
What is the CVSS score of CVE-2021-4105?
CVE-2021-4105 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-4105?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-4105, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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